`clippy::unnecessary_to_owned`

Pass the borrowed value directly; the callee never needs the owned copy.

What it reads

Clippy, with the compiler behind it. The only pass that compiles.

Lowest tier: real, and rarely urgent.

The tier bounds how severe a rule may be; its category bounds the tier.

Turn it off, or make it blocking, without touching the code it flags:

rust-doctor --rule clippy::unnecessary_to_owned=off .
rust-doctor --rule clippy::unnecessary_to_owned=error .